You hit the nail on the head when you used idioms in the speaking test.

I think you hit the nail on the head when you said that what’s lacking in our company is a feeling of confidence.

35. take for granted = to never think about something because you believe it will always be available or stay exactly the same ( coi việc có cái gì như một điều hiển nhiên nên không trân trọng khi có điều đó)

He took her help for granted without saying thank you

I took it for granted that I would find the perfect job

36. A piece of cake = very easy (dễ dàng)

“ Getting a band 6.5 in the speaking test will be a piece of cake”

“ Something easily accomplished, as in I had no trouble finding your house, it was a piece of cake”